Quick Scan seems to freeze after about 30 seconds

I installed CIS Pro 2013 and after it installed the latest virus signatures, it started an initial quick scan as I believe it should. The “Elapsed Time” display began counting and the “Status” display began showing the files being scanned. After a short time (20 or 30 seconds) the “Status” display froze while showing “” although the “Elapsed Time” continued to increase. From this point on, the program would not pause or stop when clicking those buttons. This same exact sequence of events happens every time I re-boot or shut down and cold boot, both with and without my USB wi-fi plugged in. I let it run for up to an hour, and the scanner’s process uses between 3% and 8% of the CPU. Is there something I should do, other than completely re-installing CIS?